The Air Force Research Laboratory (AFRL) is seeking industry input on capabilities for onboard enthalpy management in future reusable hypersonic aircraft systems, focusing on power generation, thermal management, and integrated technologies. This Request for Information (RFI) aims to inform near-term and mid-term program development. No specific submission timeline or budget amount is provided. The location for performance of services is not specified. Responses will help AFRL assess novel concepts and risk-reduction strategies for auxiliary power and thermal solutions.